Archive for February 8, 2022

02/08/2022 – Ephemeris – The first quarter Moon tonight

February 8, 2022 Comments off

This is Ephemeris for Tuesday, February 8th. Today the Sun will be up for 10 hours and 8 minutes, setting at 6:01, and it will rise tomorrow at 7:51. The Moon, at first quarter today, will set at 2:34 tomorrow morning.

The Moon tonight, will be about 12 hours past being exactly first quarter, so it will be showing to be just a bit gibbous, that is a bit more than 50% illuminated by the Sun from our vantage point. In binoculars, the gray lunar seas, which are actually frozen lava filled plains, dominate the upper right quarter of the Moon. At the bottom, or south end of the Moon are the lighter more cratered region of the Moon called the Lunar Highlands. It is near the terminator, the line between day and night on the Moon, where shadows are longest, where craters can be seen by the shadows of the rims. Farther away from the terminator, the Sun is higher in the Moon’s sky, so the shadows get shorter or disappear all together.

The astronomical event times given are for the Traverse City/Interlochen area of Michigan (EST, UT – 5 hours). They may be different for your location.


Hours after first quarter moon

The is what the Moon might look like tonight, hours after first quarter. Just a bit of Mare Imbrium (Sea of Showers) is visible. Mare Serenitatis is the Sea of Serenity, Mare Tranquilitatis is the Sea of Tranquility. The green annotation is mine. BTW, Mare is pronounced Mar-e. It’s Latin, meaning sea. Created using Virtual Moon Atlas, a free app that can be downloaded from a link on the right, or listed under Free Astronomical Software.